Hydra REVISED by Lotharek

861.00  Tax included

Items Sold: 1



Hardware, manuals, FAQ, and other info on manufacturers website – HERE

Please, be prepared for delayed postage. At least 10 days.

Fully automatic SCART switch with full galvanic inputs separation.

How does it work?

Imagine, you have many retro systems in use. Amiga, Atari ST, ZX spectrum, etc… and you have only one TV/Monitor with one SCART INPUT. Each time, you want to switch the system, you have to connect your machine to your monitor. Every time, You do it – you damage the SCART socket. Those days are over. Connect up to 8 computers/consoles to HYDRA, then connect HYDRA to Your TV/Monitor and power on hydra with your mobile phone charger with MICRO USB plug. HYDRA will detect an active SCART input and forward all signals to your TV/monitor. Simple and efficient.

BOLD – New features compared to HYDRA1

  • 8 SCART inputs ( RGB, s-video, composite)
  • 1 SCART output
  • “Knight rider” style active SCART detection
  • Full ROHS
  • Expandable with 2 additional HYDRA HEADS devices to offer outstanding 24inputs SCART functionality
  • AVR controller with firmware future updates
  • HQ Plexi
  • MICRO USB power supply (regular mobile phone charger 5V1A will do the job)
  • Improved signal detection hysteresis – all cables shall work now
  • Audio buffer for SCART audio output to reduce “hearable audio pops” 
  • SYNC ON GREEN  mode for SCART input 2 (SW7 – SOG SWITCH)
  • RGB ONLY / AUTO mode for SCART input 8 (SW8 )


Do not use garbage power supply – any decent micro USB mobile charger will do the work.. and please be careful with USB SOCKET 😉

NEVER connect/disconnect SCART PLUGS  while HYDRA is POWERED ON especially when CONSOLE/COMPUTER is also POWERED ON!

I’ve put much effort into the ability to pass through many types of signals: from composite to component. To protect the device and not to cut signal range, HYDRAs have additional ESD protection diodes, but for a short period of time when scanning for active SCART, Hydra is defenseless. If You got to hit that moment by plugging a powered-on device, You will damage the RGB chip with ESD voltage that may reach thousands of volts (not dangerous for you, but electronics is fragile..). This chip may become very hot and protection will probably brick hydra till one of the chips is replaced (NCS2564). The cost of repair is 10Euro !!!

Possible symptoms:

  • knight rider effect stops
  • one SCART port doesn`t work
  • Interferences between ports
  • HD led doesn`t work anymore
  • only one port gives the correct picture; others are darker…


  • No tricky electronics inside as NOT NEEDED. Hydra has built-in all necessary features
  • Hydra accepts the following sync signals at pin 20 of SCART:
    • Composite video
    • Luma
    • Composite sync  ( please, read FAQ tab above)


  • Left – scan for active source to the left from active one (if active is far left, no action) /  next SCART in manual mode
  • Right – scan for active source to the right from active one (if active is far-right, no action) / previous SCART in manual mode
  • Middle – HD/LOW PASS filter (led on/off) – default ON
  • Left+right pressed – disables “knight rider led effect”
  • Middle + right – Automatic/manual mode


Hydra 8port SCART switcher, maybe “easily” expanded with 2 additional HYDRA HEADS devices to offer outstanding 24inputs SCART functionality.

How does it work?

After establishing a connection with flat cables between HYDRA (master unit) and HYDRA HEADS (slave unit), the user forces HYDRA to work with HEADS expansion and 8 additional SCART inputs it offers.

To obtain the above functionality,  jumper (solder pads) JP1 must be shorted. From that moment, HYDRA does scanning between 16 SCART input ports in search for active one to route all signals to output SCART.

How about connecting another Hydra Heads to an already connected one?

Additional Hydra Heads units may be added to previously installed ones to achieve 24 inputs. JP2 jumper needs to be shorted.


Additional information

Weight 0.7 kg
Dimensions 40 × 18 × 18 cm